Proportioning and mixing apparatus



Dec. 18, 1956 V H. M. HANSON 2,774,657

PROPORTIONING AND MIXING APPARATUS Filed March 25, 1954 4 Sheets-Sheet 1 FIG. I

INVENTOR.

HARTWIG M. HANSON BY v Dec. 18, 1956 Filed March 25, 1954 H. M. HANSON PROPORTIONING AND'MIXING APPARATUS 4 Sheets-Sheet 2 INVENTOR.

HARTWIG M. HANSON Dec. 18, 1956 H. M. HANSON 2,774,657

PROPORTIONING AND MIXING APPARATUS FiledvMarch 25, 1954 4 Sheets-Sheet 3 Dec. 18, 1956 H. M. HANSON ,774,

PROPORTIONING AND MIXING APPARATUS INVENTOR HARTWIG M. HANSON United States Patent 2,774,657 I PROPORTIONING AND'MDKINGAPP-ARATUS Hartwig'M; Hanson; Baltimore, Mdt, assignor to' The G. M; Kemp Manufacturing Company, Baltimore, Milt, a corporatiou of Maryland 7 ApplicatiouMarch 25, 1954,SeriaLNo..41t' ,I-3'l 6 Claims. (21. 48-484) The present: invention relates to animproved apparatus for the mixing of gases: andis; particularly adapted: to; the mixing-of air and. a; combustible gasinthe desired proportions. Y

Toobtain arcontinuous; flow anda completely combustible mixture of air andgas is very difficult. In mixing thesegases,. orair and gas, usually the air. and. gas are each under aconstant pressure,.or1 either. or both may be under a predetermined vacuum after the mixingphas taken-place.

Numerous-devices have been designed for thispurpose as; illustrated in the patent to- W. W. Kemp et al.', Nos. 1-,771 2-23 and: 1,880,141, and whilethese proportional mixers are satisfactory; there are occasions where a more accurate mixture is required, since the constituentsof the gas not only vary; from time to time, but. the carburetor is used with various: gases. It is. to obtain thismore accurate mixture that, the present improvement has been developed. o

The primary object of the invention is to,- provide a proportional gas-mixingapparatus in which thepropprtions, of the several gases may be moreprecisely} regulated. Another object ofthe invention is: to providev means without thedevice for making allthe adjustmenttoail the. flow control. means. 7

A further object oftheinvention is toprovide such'an apparatus in a compact and economicaldesigni With these'and; other objects inviewz, thegeneralaprincipl'es of the invention areillustrated in, the. accompanying drawings and-described in the; detailed} description that follows together with the manner in-1which the-improved mixing; apparatus is constructed incl-udingjts uses j and advantages, in which:

Figure 1 is a top plan view of acarburetor involving this-invention. V

Figure 2 is a verticalsectional viewtaken along; the line 2-2 of Figure 1.

Figure 3 is a horizontal sectional view takeri valong the 'improvedimechanism for varyingthe'extentj of-the open jing of one of the gas ports.

7 Figures 7 is a sectional view taken along' ithei line;.7 -7

' In referring to the drawings like charactersrare,used

to designate'like parts throughoutthe several views. I

While. the device is;.adapted to. thepropcrtionatemixing of many types offfgases, its primarypurpose, istt-o mix ..air with the proper proportion of'combustiblegasigfor'" complete. combustion and therefore the detailedldescriptionwill follow generally its primary purpose;

-The device-is provided with a body;portio'n,-lor casing 1 in which the interioris. divided, by partitions; r. walls 2, 3 and 4 to provide independent air and gas chambers" 5 and-i6-anda-mixing chamber 7'. The; chambers 5' and 6- are'provided-iwith inlets. 8t and 9 respectively for admitting; air and gas into the chamber. The chamber 7 isprevided-with. an outlet: 10 for: conveying themixture toits place of use. In order to conveniently assemble and service the device. the casing is provided. with aremovable cover 11 having handles 12 and 13 The cover is'fastened to the casing by: a plurality of screws, to effect a; tight seal as the. covermember itself encloses part of the mixing chamber 7.. The casing is generally providedwith a'reintorcedprojecting ring as shown at 15-; to which are fixedly secured to thestationary supports 16 and 17{ upo n which the devicemay rest;

The and gas chamber dividing walls-2,3 and4 extendupwardly from thebottom: of the casing to a plane passinghorizontally through the upperhalf of the easing, as shown in Figures .2. and. 5. Over the top of the two chambers 5 and 6 is a stationary top plate 18 in which a series of ports or. rectangular-shaped apertures 19 are provided over the air chamber and a similar series of. ports 20 areprovided in the plate over the gas chamber. The. top of the; plate. 18 ismachined and' polished throughout. its entireupperareacovering both the air and. gas ports to provideasmooth flatsurface. The mixing chamber occupies the remainder of the casing, ex-

tending; over and aroundthe air and gas chambers including, the area over the. plate 18 in order to receive the mixture of air and. gas after. they have passed throng the;ports.v

For regulating thesizeof theports,.there is provided amovable or slidablevplate 21.7 This plate is provided with a, machinedIand. polishedruuder surface slidably receivable over the. upper surface of the plate 18. In the movable plate 21 thereare rectangular ports, correspondingtinsizei andshape with the ports mentioned in the plate 18 except, the ports in plate 21 are of'such length as to cover both an air and, corresponding gasvport in the stationary plate 18; The plate 21 is. generally referred to as a slide valve and is, adapted to be moved back and forth over the stationary plate 18' to vary the size of the cor-responding port openings. The size, of the valve Openings areigauged-bythe demand for the mixture which is reflectedby the suction in thefline leading from the "mixing: chamber'through the, outlet 10. or, the differential in pressure in the fair i'nlet'and the. mixture outlet.-

' To operate the slide valve there .isprovided a movable diaphragm member-llgfhavin'g. between its plates a diaphragm 23; which is-located preferably adjacent the bottom of the mixing chamber andis subject at its botports as, the member, 24 is. moved 'by the action ofth'e diaphragm"mernber 22'. Attached'tofthe upper end-of the arms 28, ar'einiembersdfi adapted 'to' receive abar 30 which is parallel with the; pivot pin 26. Extending over the plate 2 1'arid" integral therewithralong its lateral edges are avpairi'ofiba'r members'filand 32. These bar members have. extended ,endfprortions 3,3 and-34which also engage the bar 30. 'By this'linkage,.whenlthe member 2'47 is moved'fdownw'ardly by pressure upon the diaphragm memberQZZ, the upper'pla'tell will be moved over tlie. stationary plate, 18 in theidirection ofthe arrow in FigureZand whenithepressureis jr eleased the plate 21 will be ir ov'ed'finthe opposite. direction'which will regulate thsiie of both air and gas ports simultaneously in relation to the pressure present in the mixing chamber or the line connected therewith.

The sliding plate 21 is adjustable transversely of its normal reciprocating movement over the port openings by an adjusting screw 35. The screw 35 extends through the casing and is provided with a combination non-rotatable slidable hollow threaded tube and head 36 in order that the tube may be longitudinally moved from outside the casing. The inner end of this tube is formed with a' round head to operate within a bayonet type slot 37 formed within a member 38 fixedly secured to one of the lateral edges of the plate 21. This adjustment of the plate 21 is to relatively adjust the size of the respective air and gas ports and its purpose is similar to that for the adjustment shown and described in Patent No. 1,880,141.

It has been found that with the greater opening of the ports together, the gas proportional flow is slightly less, when all the ports are rectangles, and to compensate for this lessening of proportional gas flow, the end of one of the ports in plate 21, over the gas ports, is angled as shown at 38, to admit more gas as the ports are opened together by movement of plate 21.

In addition to the reciprocating adjustment and the lateral adjustment of the plate 21 for controlling simultaneously the size of all the port openings, there is a finer and more delicate adjustment in the size of one of the end gas ports as shown best in Figures 3 and 6. This gas port has an additional or extended area designated as of any convenient shape, but shown herein as being of rectangular form. This particular area is adapted to be opened or closed by an independent auxiliary valve, which consists of an arcuate plate 39 having an open side 40, the plate having a depending pivoting bearing 39' held down by a screw 41. This plate is so arranged and of such thickness that the upper surface is in a plane with the upper surface of port plate 18, the plate 18 having an arc cut therefrom for plate 39 to rotate therein, in order that the plate 21 may slide over the auxiliary valve in its reciprocating movement over the surface of the valve plate 18.

This auxiliary arcuate valve plate 39 is operated from outside the casing by means of an internally threaded knurled wheel 42 which is rotatably mounted in a frame 43. Extending through bearings 44 and 45 in the frame 43 is a slidable threaded stem 46 fitting Within the threaded knurled wheel 42. The frame 43 is secured about a suitable opening in the casing through which the inner end of the stem extends. stem 46 is provided witha bifurcated yoke 47 into which a link plate 48 is hinged. Secured to the plate 39 is an arm 49 with a projection 50 which is in turn hingedly connected with the link plate 48. Link plate 48 has a bolt 51 therein moving in slot 52 in projection 50 to allow the straight movement of stem 46 to rotate projection 50 without binding. I

Bythis arrangement the wheel 42 having a threaded aperture for the threaded stem 46 will move the slidable The inner end of the stem through the wheel and frame 43 when the wheel is rotated. Through the link connection with the arm 49, the arcuate plate 39 may be moved about its bearing 39. As the arcuate plate 39 is rotated, the open side wall 40 of the plate is moved over the area portion 20 to regulate the size of'the opening to vary the admission of gas therethrough. Plate 21is suitably shaped to cover and uncover this auxiliary valvein its normal movements of reciprocation. The sidewise adjustment of plate 21 never uncovers the valve providedby plate, 39, only the reciprocation of that plate uncovers this auxiliary valve,

The additional opening provided by valve plate 39 is of V shape, with the top of the V directed towardthe body of plate 18, and inthe direction of reciprocation of further open the plate39 is, the greater the flow of ga s shape of the opening provided by rotating valve plate 39 gives greater flow at the far end of the reciprocation of plate 21.

When the correct mixture can not be made by the adjusting screw 35 which moves the plate 21 laterally over both series of ports to determine their respective sizes, it may be made by adjusting the arcuate valve 39 as previously described.

Having fully described the invention, it is to be understood that it is not to be limited to the detailed description of the preferred form illustrated herein, but the scope of the invention may be determined from the appended claims.

What is claimed as new and is desired to be secured by Letters Patent is:

' 1. In a gas and air mixing device, the combination of a gas tight closed partitioned casing having air, gas and mixing chambers therein, the casing having inlet openings leading through the casing wall and connecting with the respective air and gas chambers and having an outlet leading through the casing wall to the mixing chamher, an orificed flat cover plate extending over the outlet ends of said air and gas chambers, an orificed slide valve slidable over said fiat cover plate over the air and gas chambers, a diaphragm subjected to the pressure of the air and gas mixture in the mixing chamber, automatic valve operating means positioned within the casing having one end connected with said slide valve and the other end connected with said diaphragm whereby the slide valve will he slid over the orifices of the cover plate 'by movement of the diaphragm in response to the pressure of the air and gas in the mixing chamber to vary the size of all the air and gas orifices simultaneously and an auxiliary orifice closing valve in one of the gas orifices of said orificed cover plate for closing a portion of said gas orifice said portion being also covered and uncovered by said slide valve, means extending outwardly through the casing for adjusting the auxiliary valve independently of the action of the diaphragm and in cooperation with the slide valve operated thereby.

2. In a device as claimed in claim 1 in which one of the end gas orifices includes a small additional area in comparison to the remaining gas orifices with the auxiliary orifice closing valve positioned adjacent the orifice having the additional area for regulating the size of opening the additional area, the said valve being flush with the upper surface of the orifice containing cover plate.

3. In a device as claimed in claim 2 in which the auxiliary valve-adjusting means includes a threaded stem threadedly engageable with a rotatable. wheel outside the cover for operating the valve.

4. In a device as claimed in claim 1 in which the auxiliary valve is pivotedly secured to the orifice cover plate and is adapted to swing over and close a predetermined area of an orifice in the cover plate.

5. In a gas and air mixing device, the combination of a tightly closed partitioned casing having air, gas and mixing chambers therein, the casing having inlet openings leading through the casing wall and connecting with the respective air and gas chambers and having an out let leading through the casing wall to the mixing chamher, an orificed flat cover plate extending over the outletends of said air and gas chambers, an orificed slide valve slidable over said flat cover plate over the air and gas chambers, means to reciprocally slide the slide valve to vary the flow of air and gas therethrough simultaneously, means to adjustthe position of said slide valve to vary the proportions of air and gas flowing therethrough and an auxiliary orifice closing valve in one of the gas orifices of said orificed cover plate for closing a portion of said gas orifice said portion being also covered and uncovered by said slide valve, means extending' outwardly through the casing for adjusting the auxiliary valve independently of the action of the sliding means and of the adjusting means.

6. In a gas and air mixing device, the combination of a tightly closed partitioned casing having air, gas and mixing chambers therein, the casing having inlet openings leading through the casing wall and collecting with the respective air and gas chambers and having an outlet leading through the casing wall to the mixing chamber, an orificed fi-at cover plate extending over the outlet ends of said vair and .gas chambers, an orificed slide valve slidable over said fiat cover plate over the air and gas cham hers, means to reciprocally slide the slide valve to vary the flow of air and gas therethrough simultaneously, and adjustable auxiliary valve means in one of the .gas orifices of said orificed cover plate and flush with the slide valve, shaped to provide a substantially V-shaped orifice opening toward the slide valve and covered and uncovered thereby in its reciprocation and extending in the direction of sliding of the slide valve adjacent the orifice cover plate over the gas chamber to provide an additional gas inlet area to the mixing chamber which increases in size both because of the withdrawal of the reciprocating plate in its reciprocation and of the direction and shape of the auxiliary valve orifice.

References Cited in the file of this patent UNITED STATES PATENTS 1,771,223 Kemp July 22, 1930 1,880,141 Kemp Sept. 27, 1932 2,073,299 Ensign Mar. 9, 1937 2,496,586 Kemp Feb. 7, 1950 

6. IN A GAS AND AIR MIXING DEVICE, THE COMBINATION OF A TIGHTLY CLOSED PARTITIONED CASING HAVING AIR, GAS AND MIXING CHAMBERS THEREIN, THE CASING HAVING INLET OPENINGS LEADING THROUGH THE CASING WALL AND COLLECTING WITH THE RESPECTIVE AIR AND GAS CHAMBERS AND HAVING AN OUTLET LEADING THROUGH THE CASING WALL TO THE MIXING CHAMBER, AN ORIFICED FLAT COVER PLATE EXTENDING OVER THE OUTLET ENDS OF SAID AIR AND GAS CHAMBERS, AN ORIFICED SLIDE VALVE SLIDABLE OVER SAID FLAT COVER PLATE OVER THE AIR AND GAS CHAMBERS, MEANS TO RECIPROCALLY SLIDE THE SLIDE VALVE TO VARY THE FLOW OF AIR AND GAS THERETHROUGH SIMULTANEOUSLY, AND ADJUSTING AUXIALLY VALVE MEANS IN ONE OF SAID GAS ORIFICES OF SAID ORIFICED COVER PLATE AND FLUSH WITH THE SLIDE VALVE, SHAPED TO PROVIDE A SUBSTANTIALLY V-SHAPED ORIFICE OPENING TOWARD THE SLIDE VALVE AND COVERED AND UNCOVERED THEREBY IN ITS RECIPROCATION AND EXTENDING IN THE DIRECTION OF SLIDING OF THE SLIDE VALVE ADJACENT THE ORIFICE COVER PLATE OVER THE GAS CHAMBER TO PROVIDE AN ADDITIONAL GAS INLET AREA TO THE MIXING CHAMBER WHICH INCREASE IN SIZE BOTH BECAUSE OF THE WITHDRAWAL OF THE RECIPROCATING PLATE IN ITS RECIPROCATION AND OF THE DIRECTION AND SHAPE OF THE AUXILIARY VALVE ORIFICE. 